You manage to find the perfect one, a bigfoot costume. 8-foot tall, covered in thick brown fur, an ape-like face and massive feet, the thought of becoming this muscular behemoth made your mouth water, especially as you played with the thick, long cock, dangling on it pelvis. You rush back to the filthy changing room and completely strip naked ready to don the suit. You unzip the zipper and slide in, pulling the mask over your head and zipping it back up. Almost instantly, you're the sasquatch you had watched to be. You grasp your thick cock in your muscular hands and jack off, spraying cum everywhere , letting out a massive ape like wail as you do. It's the moment of truth now though. You slide the dirty brown diaper around your massive sasquatch feet and yank it up, managing to stretch it around your new, large body. You feel the change begin, your asshole streches wide, so much wider than your old human one. A loud gassy fart tears through the silence, releasing a large mound of green, warm Sasquatch shit behind it, pressing up against your hairy ass, further filling the diaper. You grin some more, content with your new change. Absentmindedly you reach your large ape, sausage fingers into your diaper and pull out a large clump of it. You don't know why, be it your new bigfoot mind or something else but somehow you just can't help but spoon it into your mouth, savoring the vile, meaty pile of shit, fully giving into your new life.